I'm not familiar with the compact version, but the USH is my favourite and definitely my most accurate slug gun. It groups well with many premium sabot slug loads, and amazingly well with some. I'm on my second one, and it favours different loads than the first one did, so it's pretty much a case of experimenting to find your best choice, sort of like most .22 rimfires.
Pros: very accurate, totally reliable, excellent out-of-the-box trigger, compact size and good handling
Cons: single shot may not appeal to everyone, quite heavy (actually a plus when it comes to recoil), tricky to scope due to interference with hammer, not the prettiest gun in the safe
Overall I feel that it's the best value by far in a rifled-barrel slug gun on the market and recommend it highly.